Scope and reaction mechanism of an aerobic oxidative alkyne homocoupling catalyzed by a di-copper-substituted silicotungstate
作者:Noritaka Mizuno、Keigo Kamata、Yoshinao Nakagawa、Takamichi Oishi、Kazuya Yamaguchi
DOI:10.1016/j.cattod.2010.02.073
日期:2010.11
TBA = tetra-n-butylammonium) could act as an efficient reusable homogeneous catalyst for the aerobic oxidative alkyne homocoupling. Various kinds of structurally diverse terminal alkynes including aromatic, heteroaromatic, aliphatic, double bond-containing, silylacetylene, propargylic alcohol, and propargylic amine derivatives could selectively be converted into the corresponding diynes in the presence of I.
二-铜-取代的γ-Keggin型硅钨TBA 4 [γ-H 2硅钨酸10 ö 36的Cu 2(μ-1,1-N 3)2 ](我,TBA =四Ñ -butylammonium)可以充当作为有效的可重复使用的好氧氧化炔烃均相催化剂。在I的存在下,包括芳族,杂芳族,脂族,含双键,甲硅烷基乙炔,炔丙基醇和炔丙基胺衍生物在内的各种结构多样的末端炔烃可以选择性地转化为相应的二炔。I的催化活性它比单铜取代的硅钨酸盐,单体铜络合物和简单的铜盐要高得多,表明I中的双铜核在目前的炔均偶联中起着重要的作用。已经提出了反应机理,该反应机理涉及形成二铜(II)-炔基中间体,还原性消除二炔,以及被O 2再氧化还原的铜物质。